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Renesas ISL9111EH33Z-T
- Part No.:
- ISL9111EH33Z-T
- Manufacturer:
- Renesas
- Package:
- SOT-23-6
- Datasheet:
-
ISL9111EH33Z-T.pdf
- Description:
- IC REG BOOST 3.3V 800MA 6SOT
- Quantity:
- Payment:
- Shipping:
Inventory:4,630
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Product details
Overview
ISL9111EH33Z-T from Intersil is a low-input-voltage, high-efficiency synchronous boost converter with integrated 1A N- and P-channel MOSFETs, delivering fixed 3.3V output from single/dual-cell alkaline/NiMH batteries. It starts up at 0.8V, operates down to 0.7V (UVLO enabled), achieves up to 97% efficiency at 3.3V/100mA (VIN=0.9V), and uses a 1.2MHz switching frequency to enable compact 4.7µH inductor + ceramic capacitor designs for portable medical and audio devices.
For engineers reviewing the ISL9111EH33Z-T datasheet, ISL9111EH33Z-T pinout, ISL9111EH33Z-T application, or ISL9111EH33Z-T equivalent, key selection criteria include minimum startup voltage (0.8V), UVLO protection threshold (0.7V), 3.3V ±100mV output accuracy, 20µA quiescent current in skip mode, and fault reporting via dedicated FAULT pin - all critical for battery life and system reliability in space-constrained, low-power embedded systems.
Technical Context
The ISL9111EH33Z-T implements peak current-mode PWM control with internal compensation and a 1.2MHz oscillator, enabling stable regulation across wide input ranges (0.8V–VOUT−200mV). Its synchronous rectification replaces lossy Schottky diodes with low-rDS(ON) MOSFETs (0.2Ω N-ch / 0.35Ω P-ch), minimizing conduction loss.
Under light load, it enters skip mode-triggered after eight consecutive zero-current crossings-reducing switching activity while maintaining regulation and cutting quiescent current to 20µA. Output disconnect during shutdown prevents battery drain, and UVLO (0.7V threshold) protects rechargeable cells from over-discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±100mV - ensures stable rail for 3.3V logic, USB-OTG PHY, and Bluetooth baseband ICs without external feedback resistors. |
| Startup Voltage | 0.8V typical - enables operation from deeply discharged single-cell alkaline/NiMH batteries, extending usable runtime. |
| UVLO Threshold | 0.7V - shuts down before rechargeable battery over-discharge, preserving cycle life and safety. |
| Quiescent Current | 20µA typical in skip mode - minimizes no-load battery drain in always-on portable devices like wireless headsets. |
| Switching Frequency | 1.2MHz (1.0–1.4MHz range) - allows use of tiny 4.7µH inductors and low-ESR ceramic capacitors, reducing solution footprint by >40% vs. 500kHz converters. |
| Peak Switch Current | 1.0A typical - supports up to 240mA output at 3.3V from dual-cell input (VIN=1.8V), sufficient for MP3 players and medical sensors. |
| Fault Protection | OVP not applicable (fixed version); OTP (150°C), short-circuit, and low-VIN shutdown - provides robust field reliability without external supervision circuitry. |
Pinout & Package
ISL9111EH33Z-T is housed in a Pb-free 6-lead SOT-23 package (JEDEC MO-178AB, pkg drawing P6.064), optimized for thermal performance (θJA = 146°C/W) and board-level reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switching node | Connects to inductor's switch-side terminal; carries high di/dt current - requires short, wide trace to minimize EMI and voltage spikes. |
| 2 - GND | Power ground | Primary return path for input/output capacitors and MOSFET sources - must tie directly to solid ground plane to ensure stability and noise immunity. |
| 3 - EN | Enable input | Active-high logic control (0.8×VIN high, 0.2×VIN low); pulls device into <1µA shutdown state when low, enabling system-level power gating. |
| 4 - FAULT | Fault open-drain output | Sinks current when low during UVLO, short-circuit, or thermal fault - connects to MCU GPIO for real-time health monitoring and graceful shutdown. |
| 5 - VOUT | Regulated output | 3.3V power rail; supplies downstream logic, RF transceivers, or sensors - requires local 4.7µF ceramic capacitor placed adjacent to pin. |
| 6 - VIN | Input supply | Accepts 0.8V–VOUT−200mV; connects to battery or DC source with 4.7µF ceramic capacitor to suppress ripple and support peak current demands. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous boost architecture | Integrated 0.2Ω N-ch and 0.35Ω P-ch MOSFETs eliminate Schottky losses, enabling >90% efficiency at light loads and eliminating need for external rectifier. |
| UVLO with 0.7V threshold | Prevents deep discharge of Li-ion, NiMH, or NiCd batteries - extends battery cycle life and avoids irreversible capacity loss in rechargeable systems. |
| Dedicated FAULT pin | Open-drain output signals UVLO, short-circuit, or thermal events - enables firmware-driven fault recovery without external comparators or supervisors. |
| Output disconnect in shutdown | Zero leakage path between VIN and VOUT when EN = low - eliminates standby battery drain, critical for shelf-life-sensitive medical and remote-sensor applications. |
| 1.2MHz fixed-frequency PWM | Enables consistent EMI profile and predictable filter design; supports ultra-compact magnetics (e.g., Sumida CDRH2D18/HPNP) and X5R ceramics (AVX/Murata). |
Applications
| Portable HDMI Transmitters | Wireless Medical Sensors |
|---|---|
Use Scenario: Powering HDMI transmitter ICs (e.g., Parade PS8301) from two AA alkaline cells in handheld diagnostic tools. IC Role / Device Role / Timing Role: Primary 3.3V rail generator with fast transient response to handle HDMI hot-plug and EDID handshake surges. Use Value: 0.8V startup and 240mA capability at VIN=1.8V ensure full functionality even as batteries deplete below 1.0V/cell. |
Use Scenario: Supplying 3.3V to ultra-low-power ECG front-end ASICs and BLE radios in disposable patch monitors. IC Role / Device Role / Timing Role: Always-on power source with 20µA quiescent current, enabling multi-week battery life on coin cells or AAA alkalines. Use Value: Output disconnect during MCU sleep modes prevents microamp-level leakage, directly extending operational lifetime per battery charge. |
| Bluetooth Headsets | MP3/MP4 Players |
Use Scenario: Delivering regulated 3.3V to CSR/Qualcomm Bluetooth audio SoCs and MEMS microphones in compact ear-worn form factors. IC Role / Device Role / Timing Role: High-efficiency boost stage replacing linear regulators to maximize talk time from single-cell Li-ion or NiMH. Use Value: 97% peak efficiency at 100mA reduces thermal load in sealed enclosures, preventing thermal throttling during extended streaming. |
Use Scenario: Generating 3.3V for NAND flash controllers, LCD drivers, and audio codecs in sub-100g portable media players. IC Role / Device Role / Timing Role: Main system power rail with fault reporting to prevent data corruption during battery brownouts. Use Value: FAULT pin assertion on low-VIN triggers controlled file save and shutdown, protecting user content during unexpected power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | 0.3V startup, no UVLO, 3.3V ±2%, 1.15MHz, 0.9A switch - lacks FAULT pin and output disconnect. | Better for non-rechargeable primary cells; unsuitable where battery protection or fault logging is required. | Choose TPS61200DRCT only if lowest possible startup voltage is critical and UVLO/FAULT are unnecessary. |
| MAX8815AETE+T | 0.7V startup, UVLO at 0.6V, 3.3V ±1.5%, 1MHz, 1.2A switch - includes thermal foldback but no FAULT pin. | Higher current capability suits higher-power peripherals; missing FAULT limits system diagnostics in medical/industrial use. | Select MAX8815AETE+T when >240mA output is needed and fault signaling can be implemented externally. |
Compared with ISL9111EH33Z-T, TPS61200DRCT offers lower startup voltage but omits UVLO and fault reporting, while MAX8815AETE+T delivers higher current but lacks the integrated FAULT pin - making ISL9111EH33Z-T uniquely balanced for space-constrained, safety-aware portable electronics requiring both battery protection and system-level fault visibility.
Availability
ISL9111EH33Z-T is available at Aetrix Electronics and suitable for portable HDMI transmitters, wireless medical sensors, Bluetooth headsets, and MP3/MP4 players requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9111EH33Z-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Intersil Corporation (now part of Renesas Electronics) is a leader in precision analog and power management ICs, serving industrial, mobile computing, and high-end consumer markets with high-reliability, energy-efficient solutions.
The ISL9111 series was designed specifically for ultra-low-voltage, battery-powered portable electronics - emphasizing minimal startup voltage, high light-load efficiency, and integrated protection to extend runtime and simplify system design.
FAQ
What is the minimum input voltage required for ISL9111EH33Z-T to start up?
The ISL9111EH33Z-T has a typical minimum startup voltage of 0.8V, verified under load conditions (RLOAD = 50Ω). This allows reliable operation from single-cell alkaline, NiCd, or NiMH batteries even when deeply discharged. The device remains functional down to 0.7V input due to its UVLO threshold, after which it shuts down to protect rechargeable cells.
Does ISL9111EH33Z-T include output disconnect during shutdown?
Yes, ISL9111EH33Z-T provides true output disconnect during shutdown: when the EN pin is driven low, both internal MOSFETs turn off and the body diode polarity is reversed, blocking current flow from VIN to VOUT. This feature prevents battery drain in standby, critical for long-shelf-life medical and sensor applications.
What protection features does ISL9111EH33Z-T offer?
ISL9111EH33Z-T integrates thermal shutdown (150°C trip, 25°C hysteresis), short-circuit protection (immediate shutdown if VOUT falls below VIN), and UVLO (shuts down at 0.7V). It does not include overvoltage protection - that feature is exclusive to the adjustable (ADJ) versions. Fault conditions assert the open-drain FAULT pin low.
Can ISL9111EH33Z-T be used with a 5V output requirement?
No - ISL9111EH33Z-T is a fixed 3.3V output variant. For 5V output, use ISL9111EH50Z-T (same package and specs, but factory-trimmed to 5.0V ±100mV). The 3.3V and 5.0V versions share identical pinout, startup behavior, and protection features, differing only in internal voltage reference.
What is the quiescent current of ISL9111EH33Z-T in skip mode?
The ISL9111EH33Z-T draws 20µA typical quiescent current from VOUT in skip mode at +25°C, rising to 45µA maximum across the −20°C to +85°C operating range. This ultra-low current enables multi-week battery life in always-on portable devices such as wireless sensors and hearing aids.
ISL9111EH33Z-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.8V
- Voltage - Input (Max):
- 3.1V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 800mA (Switch)
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-SOT
ISL9111EH33Z-T FAQ
1.How can I place an order for ISL9111EH33Z-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9111EH33Z-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL9111EH33Z-T reliable?
The price and inventory of ISL9111EH33Z-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9111EH33Z-T is usually 5 days.
3.What payment methods are accepted for ISL9111EH33Z-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9111EH33Z-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9111EH33Z-T?
ISL9111EH33Z-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9111EH33Z-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL9111EH33Z-T?
For technical support, including ISL9111EH33Z-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9111EH33Z-T requirements.
6.How does Aetrix verify that ISL9111EH33Z-T is sourced from the original manufacturer or authorized distributors?
All ISL9111EH33Z-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL9111EH33Z-T meets industry standards.
7.What is the process for return or replacement of ISL9111EH33Z-T?
All ISL9111EH33Z-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9111EH33Z-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL9111EH33Z-T part is unused and in its original packaging.
Return procedure for ISL9111EH33Z-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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